BNSF Session 4 UPDATED Exam Questions
and CORRECT Answers
If you have a track relay the two common resistance of the coil are ________ Ohms and
_________ and are usually supplied with ________ volts? - CORRECT ANSWER - 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? - CORRECT ANSWER -
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. - CORRECT
ANSWER - Electric Switch Lock
What does the letter "N" designate, regarding contact adjustment, on a circuit print of a switch
circuit controller? - CORRECT ANSWER - 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? - CORRECT ANSWER - Plunger
To expedite train departure from the mainline BNSF installs a mainline _____________ circuit
ahead of the switch point for an EWL. - CORRECT ANSWER - 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? - CORRECT ANSWER - Basket
On a POSM, nomenclature can vary but if there is a NWCR and RWCR what are these relays
used to repeat? - CORRECT ANSWER - 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. - CORRECT ANSWER - The switch is lined reverse
When adjusting a power operated switch machine, always adjust the rods in the following order?
- CORRECT ANSWER - 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? -
CORRECT ANSWER - Approach Track Relay
The relay which requests and establishes the route? - CORRECT ANSWER - Route Relay and
the Route Repeater Relay
The relay which changes the signal aspect is the? - CORRECT ANSWER - Home Relay
The relay which prevents a signal clearing behind a train as it leaves the interlocker is the? -
CORRECT ANSWER - Stick Relay
A _____________ _____ _________ of 5 seconds or less shall not permit an established rout to
be changed at an automatic interlocking - CORRECT ANSWER - loss of shunt (FRA
236.309)
___________ locking prevents opposing signals from clearing once a train has a proceed signal
in the route. - CORRECT ANSWER - Traffic Locking (FRA 236.769)
Approach or time locking shall be provided for all interlocker signals capable of displaying
aspects more favorable than? - CORRECT ANSWER - Proceed at restricted speed (FRA
236.305)
Nemonic for Interlocking:
Owning
and CORRECT Answers
If you have a track relay the two common resistance of the coil are ________ Ohms and
_________ and are usually supplied with ________ volts? - CORRECT ANSWER - 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? - CORRECT ANSWER -
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. - CORRECT
ANSWER - Electric Switch Lock
What does the letter "N" designate, regarding contact adjustment, on a circuit print of a switch
circuit controller? - CORRECT ANSWER - 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? - CORRECT ANSWER - Plunger
To expedite train departure from the mainline BNSF installs a mainline _____________ circuit
ahead of the switch point for an EWL. - CORRECT ANSWER - 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? - CORRECT ANSWER - Basket
On a POSM, nomenclature can vary but if there is a NWCR and RWCR what are these relays
used to repeat? - CORRECT ANSWER - 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. - CORRECT ANSWER - The switch is lined reverse
When adjusting a power operated switch machine, always adjust the rods in the following order?
- CORRECT ANSWER - 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? -
CORRECT ANSWER - Approach Track Relay
The relay which requests and establishes the route? - CORRECT ANSWER - Route Relay and
the Route Repeater Relay
The relay which changes the signal aspect is the? - CORRECT ANSWER - Home Relay
The relay which prevents a signal clearing behind a train as it leaves the interlocker is the? -
CORRECT ANSWER - Stick Relay
A _____________ _____ _________ of 5 seconds or less shall not permit an established rout to
be changed at an automatic interlocking - CORRECT ANSWER - loss of shunt (FRA
236.309)
___________ locking prevents opposing signals from clearing once a train has a proceed signal
in the route. - CORRECT ANSWER - Traffic Locking (FRA 236.769)
Approach or time locking shall be provided for all interlocker signals capable of displaying
aspects more favorable than? - CORRECT ANSWER - Proceed at restricted speed (FRA
236.305)
Nemonic for Interlocking:
Owning
