Form D Control System (DCS) Rules apply
only where designated by Timetable, Bulletin Order, or Form D line 6.
Their purpose is to control the movement of trains. DCS rules may be
used in signaled territory or non-signaled territory. (Signaled
territory is territory where ABS Rules are in effect for the direction
of movement, and non-signaled territory is territory where ABS rules
are not in effect for the direction of movement.) CSS Rules do not
apply when non-signaled DCS rules are in effect. Form D line 2 is
required for movement in DCS territory.
400. Occupying DCS Territory
a. Form D Authority
A train must not occupy DCS territory outside
yard limits without Form D line 2 authority. All Operators involved
must receive a copy of the Form D. Form D line 2 may be issued into
or through yard limits in lieu of verbal permission. All other
provisions of Rule 93, “Movement with Yard Limits,” apply. Three
exceptions to the Form D line 2 requirement are:
- Paragraph d of this rule, “Entering DCS
Territory at a Hand-operated Switch.”
- Rule 503, “Train Movement against Current of
Traffic at an Interlocking.”
- Movement at an interlocking may be made one
train length beyond the home signal on verbal permission of the
Before granting verbal permission the
Dispatcher must ensure that the track on which movement is to be made
is clear, and no opposing movements have been authorized.
The limits of the Form D authority must be
designated by station names or whole mile post numbers. However, when
a train is authorized to enter DCS territory at a hand-operated switch
that is not at a station or whole mile post, the location of the
originating hand-operated switch may be used as the beginning of the
Form D line 2 authority. The Following table describes the limit of
the authority when line 2 ends at a station:
When line 2 ends at:
The authority end at:
An interlocking or controlled point
The home signal or controlled point signal
A passenger station
The point specified by the Dispatcher on line
The fouling point of the first switch where
opposing movements can clear
The station sign
Before issuing a Form D authority in non-signaled
DCS territory, the Dispatcher must determine that the track to be used
is clear for passenger trains and clear outside of yard limits for
Overlapping Form D authorities for opposing
movements must not be issued.
b. Operating Against Current of Traffic
Before authorizing a train to operate against
the current of traffic, the Dispatcher must ensure that opposing
movements are restricted by blocking devices or Form D.
c. Additions to Form D Line 2
The Dispatcher may direct addressee(s) to add
additional line 2 authorities to a specified direction Form D which is
still in effect.
In non-signaled DCS territory, these additions
may be issued only after the Dispatcher has determined that the track
to be used is clear, as outlined in paragraph (a) of this rule.
Additional line 2 authorities will be added to
an effective Form D as follows:
- The Dispatcher must contact the addressee(s),
state his intent to give them an additional line 2 authority, and
state the number and date of the Form D to which the line 2
authority will be added.
- The Dispatcher will then transmit the
additional line 2 authority and his initials. The addressee(s) will
repeat the authority. The Dispatcher must not transmit the “time”
of the addition to the addressee(s) until they have correctly
repeated the authority. The addressee(s) must not act upon the
additional authority until they receive the “time” of the addition.
- The Dispatcher and the addressee(s) must
record all additional information on line 2 of their Form D.
When an additional line 2 authority is
transmitted to an employee on a train, the receiving employee must
ensure that all addressed employees on the train receive the
additional information and mark their Form D accordingly. When
additional line 2’s are relayed by employees, the dictating employee
must not transmit the “time” of the addition until the receiving
employee has correctly repeated the authority.
d. Entering DCS Territory at a
The Dispatcher (or Operator when authorized by
the Dispatcher) may verbally authorize a train to enter DCS territory
at a hand-operated switch, in order to clear the switch and proceed in
the opposite direction. Before verbally authorizing the move, the
Dispatcher must ensure that:
- The segment of track to be used is clear of
opposing movement, and
- The train has received a Form D for movement
in the opposite direction.
This movement is limited to one train length
beyond the switch, and must be made at Restricted Speed with a crew
member preceding the movement and providing flag protection.
401. Operating in Non-signaled DCS Territory
a. Maximum Authorized Speed
Passenger trains must not exceed 70 MPH and
freight trains must not exceed 60 MPH, unless otherwise restricted.
b. Approaching Home Signals, Controlled
Point Signals, and Signals at the Beginning of ABS Territory.
Trains must approach home signals, controlled
point signals, and signals at the beginning of ABS territory prepared
to stop, unless a distant signal is in service. If a train is delayed
after passing a distant signal, it must approach the home signal or
controlled point signal prepared to stop.
402. Operating In a Specified Direction
a. Reverse Movement In Non-Signaled DCS
To make a reverse movement in non-signaled DCS
territory, a train authorized by Form D line 2 to operate in a
specified direction must follow one of the procedures listed below:
- The train must receive another Form D line 2,
- The train must receive verbal permission from
the Dispatcher and must proceed at Restricted Speed. The Dispatcher
must specify the location to which the train is authorized to
reverse. The Dispatcher must not authorize the train to reverse
beyond the last point by which it was reported clear. A crew member
must be stationed on the leading end of the movement to observe
conditions ahead and take action to properly control the movement of
the train, or
- The movement must be preceded by a crew member
and must proceed at Restricted Speed. Reverse movement must not go
beyond the last whole mile post or station, or
- If a train is operating against the current of
traffic, the Dispatcher may verbally authorize it to operate with
the current of traffic according to ABS rules. Before granting
permission, the Dispatcher must ensure that the track to be used is
clear of opposing movements, and must cancel the Form D line 2.
b. Reverse Movement in Signaled DCS
To make a reverse movement within the limits of
the same block in signaled DCS territory, a train authorized by Form D
line 2 to operate in a specified direction will be governed by ABS
Rule 501, “Reverse Move within the Limits of the Same Block.”
To make a reverse movement beyond the limits of
the same block in signaled DCS territory, a train authorized by Form D
line 2 to operate in a specified direction must receive a new Form D
c. Clearing DCS Territory
When a train operating in a specified direction
clears the limits of its line 2 authority, the line 2 authority is
fulfilled. When a train leaves the track specified on its Form D line
2 authority at a hand-operated switch and that switch has been
restored to normal position, the movement has cleared. A new Form D
must be issued for any further movement.
403. Operating in Both Directions
A train authorized by Form D line 2 to operate
in both directions has exclusive occupancy of the track, and may
operate in either direction. The Dispatcher must not authorize other
movements within the line 2 limits. The line 2 authority remains in
effect until canceled.
Switches within the designated limits may be
left in reverse position and unattended. Before the Form D is
canceled, however, the Conductor must ensure that all switches used by
his crew are locked in normal position.
If a crew is relieved while their Form D line 2
is still in effect, the crew being relieved must inform the new crew
of any switches left reversed. If physical contact cannot be made
with the new crew, the Dispatcher must be notified of any switches
left reversed, and the new crew must check with the Dispatcher to
obtain this information before proceeding.
405. Reporting to Dispatcher or Operator
This crew of a train must ensure that the
Dispatcher or Operator is promptly notified when their train has:
- Entered DCS territory, except when entering at
an interlocking, controlled point, or TBS, or
- Cleared the limits of their specified
direction line 2 authority, except when clearing at an interlocking
station or TBS, or when verbally relieved from clearing by the
NOTE: The Dispatcher or
Operator must not use panel board indication lights to determine that
the track is clear.
Trains may be reported clear of DCS territory
or intermediate points only after an employee has determined that the
rear car has cleared by one of the following means:
- Observing the marker
- Observing the last car number.
- Observing the telemetry device indication on
the head end to ensure that air pressure indicates brake pipe
continuity, once the head end of the train is 3 miles beyond the
- Receiving a correct axle count from an
equipment defect detector. This method may be used only when the
axle count from the detector agrees with the count of a previous
detector or with an actual axle count made by a crew member.
406. ABS Failure: Non-signaled DCS
a. Form D Line 6 or Bulletin Order
When an ABS failure occurs, non-signaled DCS
rules may be substituted by Bulletin Order or Form D line 6.
All trains and Operators affected must receive
a copy of the Form D line 6 or Bulletin Order. Before the Dispatcher
issues the Form D line 6 or before the Bulletin Order becomes
effective, the Dispatcher must ensure that:
- Interlocking and CP Signals governing entrance
to or within the affected limits are in Stop position, and
- Blocking devices are applied to the controls
of switches and signals leading to the affected limits.
Interlocking or CP signals governing entrance
to or within the affected track may be displayed to authorize
movements that have received Form D line 2 authority. Signal
indication will govern movement within interlocking limits or CP
only. These signals must be immediately restored to Stop position and
blocking devices applied once the head end of the authorized movement
has passed the signal.
ABS and CSS rules do not apply when
non-signaled DCS rules are substituted for ABS.
c. Highway Grade Crossings
Unless otherwise instructed by Bulletin Order
or Form D line 13, trains must stop and provide on-ground protection
at highway grade crossings equipped with automatic warning devices,
- The automatic warning device has been
operating at least 20 seconds, or
- If equipped with gates, they are in the
The leading end of the movement must not exceed
15 MPH over the crossing.
d. Form D Line 7: Interlocking or
Controlled Point Removed From Service
Interlocking and controlled point signals
remain in service unless otherwise specified by Bulletin Order or Form
D line 7. Before the Dispatcher issues Form D line 7 or before the
Bulletin Order becomes effective, the Dispatcher must ensure that
switch points at interlockings or controlled points to be removed from
service have been spiked or wedged for the route to be used. If the
route to be used is diverting, Form D line 1 or Bulletin Order item
must be issued to indicate speed over diverting route.
Interlockings that include a moveable bridge or a railroad crossing at
grade must not be removed from service in this manner.