BNSF Session 4 Exam Questions And Answers
(Verified And Updated)
If you have a track relay the two common resistance of the coil are ________ Ohms and _________
and are usually supplied with ________ volts?
2 Ohms, 4 Ohms, and 1-2Volts
If you have a line relay the two common resistances of the coil are ________ Ohms and ________
Ohms and are usually supplied with _________ volts?
500 Ohms, 1000 Ohms, and 10-14 Volts
In CTC territory, a hand throw switch is not sufficient protection, what else do we need to install to
prevent the hand throw switch from being operated until safe to do so.
Electric Switch Lock
What does the letter "N" designate, regarding contact adjustment, on a circuit print of a switch circuit
controller?
Front & Heal contacts made from full normal up to but not including 1/4 inch from full normal
What portion of a GRS 9B electric switch lock must be extracted from the lock rod before the switch
points can move?
Plunger
To expedite train departure from the mainline BNSF installs a mainline _____________ circuit ahead
of the switch point for an EWL.
Release
Before adjusting any power operated switch machine the points should be closed with moderate
pressure to the stock rail, if the point is gapped where would this adjustment be made to correct this?
Basket
On a POSM, nomenclature can vary but if there is a NWCR and RWCR what are these relays used to
repeat?
The switch position corresponds with the dispatcher's request
On a POSM, nomenclature can vary but if the is a NWPR and RWPR what does the RWPR indicate.
The switch is lined reverse
When adjusting a power operated switch machine, always adjust the rods in the following order?
Far PD, Far Lock, Near PD, Near Lock
The relay which requests the route for any train based on "first come first serve" is the?
Approach Track Relay
The relay which requests and establishes the route?
Route Relay and the Route Repeater Relay
, The relay which changes the signal aspect is the?
Home Relay
The relay which prevents a signal clearing behind a train as it leaves the interlocker is the?
Stick Relay
A _____________ _____ _________ of 5 seconds or less shall not permit an established rout to be
changed at an automatic interlocking
loss of shunt (FRA 236.309)
___________ locking prevents opposing signals from clearing once a train has a proceed signal in the
route.
Traffic Locking (FRA 236.769)
Approach or time locking shall be provided for all interlocker signals capable of displaying aspects
more favorable than?
Proceed at restricted speed (FRA 236.305)
Nemonic for Interlocking:
Owning
Real
Expensive
Luxury
Cars
Lets
People
Realize
UR
Rich
Occupy the Track
Request the Track
Establish the Route
Lock the Route
Clear the Signal
Light the Signal
Pick the Stick
Release the Route
Unlock the Route
Release the Stick
With regards to interlocking "Occupancy" involves what relay(s):
Relays down: ATR, TR, AR, APR
With regards to interlocking "Request the Route" involves what relay(s):
Relay up: RR
With regards to interlocking "Establish the Route" involves what relay(s):
(Verified And Updated)
If you have a track relay the two common resistance of the coil are ________ Ohms and _________
and are usually supplied with ________ volts?
2 Ohms, 4 Ohms, and 1-2Volts
If you have a line relay the two common resistances of the coil are ________ Ohms and ________
Ohms and are usually supplied with _________ volts?
500 Ohms, 1000 Ohms, and 10-14 Volts
In CTC territory, a hand throw switch is not sufficient protection, what else do we need to install to
prevent the hand throw switch from being operated until safe to do so.
Electric Switch Lock
What does the letter "N" designate, regarding contact adjustment, on a circuit print of a switch circuit
controller?
Front & Heal contacts made from full normal up to but not including 1/4 inch from full normal
What portion of a GRS 9B electric switch lock must be extracted from the lock rod before the switch
points can move?
Plunger
To expedite train departure from the mainline BNSF installs a mainline _____________ circuit ahead
of the switch point for an EWL.
Release
Before adjusting any power operated switch machine the points should be closed with moderate
pressure to the stock rail, if the point is gapped where would this adjustment be made to correct this?
Basket
On a POSM, nomenclature can vary but if there is a NWCR and RWCR what are these relays used to
repeat?
The switch position corresponds with the dispatcher's request
On a POSM, nomenclature can vary but if the is a NWPR and RWPR what does the RWPR indicate.
The switch is lined reverse
When adjusting a power operated switch machine, always adjust the rods in the following order?
Far PD, Far Lock, Near PD, Near Lock
The relay which requests the route for any train based on "first come first serve" is the?
Approach Track Relay
The relay which requests and establishes the route?
Route Relay and the Route Repeater Relay
, The relay which changes the signal aspect is the?
Home Relay
The relay which prevents a signal clearing behind a train as it leaves the interlocker is the?
Stick Relay
A _____________ _____ _________ of 5 seconds or less shall not permit an established rout to be
changed at an automatic interlocking
loss of shunt (FRA 236.309)
___________ locking prevents opposing signals from clearing once a train has a proceed signal in the
route.
Traffic Locking (FRA 236.769)
Approach or time locking shall be provided for all interlocker signals capable of displaying aspects
more favorable than?
Proceed at restricted speed (FRA 236.305)
Nemonic for Interlocking:
Owning
Real
Expensive
Luxury
Cars
Lets
People
Realize
UR
Rich
Occupy the Track
Request the Track
Establish the Route
Lock the Route
Clear the Signal
Light the Signal
Pick the Stick
Release the Route
Unlock the Route
Release the Stick
With regards to interlocking "Occupancy" involves what relay(s):
Relays down: ATR, TR, AR, APR
With regards to interlocking "Request the Route" involves what relay(s):
Relay up: RR
With regards to interlocking "Establish the Route" involves what relay(s):
