When is an APA used?
In CBTC territory when the proceed authority that is normally provided by the signaling system in operation is not available
EXAMPLES:
- CBTc system failure
- proceed authorities, unable to be issued or received due to failure of signaling equipment
- Failure of points
- disabled train rescue
- Removing portion of a divider train
- Perform a non-signal move
- Failure of the platform screen door system
- an emergency to allow passengers egress via station platform
How must drivers proceed under an APA
Extreme caution
Limits of APA movement
NFS
Next CBTC block marker board
Disabled train
Or if above not available then next clearly identifiable wayside asset
For non reporting trains in mixed mode areA, when are apas given
Signal unable to placed to proceed
 wrong line moves
Disabled train rescue
When is an apa transmitted?
Signal is unable to display a proceed aspect
Loss of comms or CBT failure, irregularity and unable to operate under aTP (auto train protection)
Failure of points
When is an apa Dictated
Approaching a disabled train
Non-signal movement or wrong line movement
Attached to portion of a divided train
When transmitted which portions of the APA need to be repeated back
Sections 3 & 4

(Authority to proceed and any special instructions or conditions)
When can a driver proceed under an APA?
When it is understood by the driver
When there is a failure of points detection is APA transmitted or dictated
Transmitted only once points are set
When the APA is dictated, does the driver need to contact the signal to let them know the move is complete
Yes
When the APA is transmitted, does the driver need to let the Sign know that the APA has been fulfilled?
No
The signal can see via wayside comms that the driver has stopped and transitioned to AM mode
When can an APA be cancel?
If the movement cannot be completed
If the movement has not started yet
If a driver is relieving when the train has an APA, what must the driver do prior to departure?
Contact the Sign and verify the contents of the APA
