jordon412

May 1st, 2017, 09:44 AM

Anybody who has experience using ATLS to operate railroad crossings know that how far to place the triggers from the road to activate the crossings before the train passes thru them can be a bit difficult. However, I've found a way to place the triggers without the trial and error in finding where to place them. You will need the following:

A calculator

And a way to convert Miles per Hour to Feet per Second

First you will need to convert the speed limit where you want to place the ATLS crossing. We'll start with the default speed limit in Trainz: 40 Miles per Hour.

40 Miles per Hour x 5280 Feet (1 Mile = 5280 Feet) / (divided by) 60 (Minutes per Hour) / (divided by) 60 (Seconds per Hour) = 58.666666666 Feet per Second

Now we need to look at the crossing:

There are two settings you need:

The intervals for flashers in seconds

Gate delay

The intervals for flashers in seconds determines how fast the lights will flash. The default is .75 seconds per flash.

The Gate delay is how many times the lights will flash before the gates begin to lower. The default is the lights will flash 5 times before the lights begin to lower.

By multiplying the gate delay by the intervals you will get the seconds between the lights starting to flash and the gates start to lower.

5 (flashes before the gates begin to lower) x .75 seconds (how fast the lights will flash) = 3.75 seconds delay between the lights starting to flash and the gates starting to lower.

With the Feet per Seconds and the delay between the lights starting to flash and the gates starting to drop, you can now determine how far away the triggers have to be from the crossing so that the crossing lights are activated and the gates start to drop by the time the train passes thru the crossing:

58.6666666666 (feet per second) x 3.75 (seconds before the gates start to drop) = 220 feet the trigger has to be away from the crossing for the train to pass thru the crossing at the same time the gates begin to drop.

However, at least for me, I don't know how long it takes for the crossing to drop to where it blocks the road. Because of this, I double the distance between the gates starting to drop and the gates are down, blocking the road:

58.666666666 (feet per second) x 3.75 (seconds before the gates start to drop) x 2 (to make sure the gates are down) = 440 feet

Therefore, in order for the gates to be down before the train, traveling at 40 miles per hour, passes thru the crossing, the outermost trigger (which actives the crossing) should be 440 feet away from the crossing. However, I would place the trigger 660 feet, 1/8th of a mile away, to be 100% certain that the gates are down when the train goes thru the crossing.

Please note that depending on the speed, the distance that you have to place the outermost trigger will have to be closer or further away from the crossing so that the gates are down by the time the train passes thru the crossing.

This math applies also to any crossings without gates.

Hopefully anyone who read this is able to understand it.

A calculator

And a way to convert Miles per Hour to Feet per Second

First you will need to convert the speed limit where you want to place the ATLS crossing. We'll start with the default speed limit in Trainz: 40 Miles per Hour.

40 Miles per Hour x 5280 Feet (1 Mile = 5280 Feet) / (divided by) 60 (Minutes per Hour) / (divided by) 60 (Seconds per Hour) = 58.666666666 Feet per Second

Now we need to look at the crossing:

There are two settings you need:

The intervals for flashers in seconds

Gate delay

The intervals for flashers in seconds determines how fast the lights will flash. The default is .75 seconds per flash.

The Gate delay is how many times the lights will flash before the gates begin to lower. The default is the lights will flash 5 times before the lights begin to lower.

By multiplying the gate delay by the intervals you will get the seconds between the lights starting to flash and the gates start to lower.

5 (flashes before the gates begin to lower) x .75 seconds (how fast the lights will flash) = 3.75 seconds delay between the lights starting to flash and the gates starting to lower.

With the Feet per Seconds and the delay between the lights starting to flash and the gates starting to drop, you can now determine how far away the triggers have to be from the crossing so that the crossing lights are activated and the gates start to drop by the time the train passes thru the crossing:

58.6666666666 (feet per second) x 3.75 (seconds before the gates start to drop) = 220 feet the trigger has to be away from the crossing for the train to pass thru the crossing at the same time the gates begin to drop.

However, at least for me, I don't know how long it takes for the crossing to drop to where it blocks the road. Because of this, I double the distance between the gates starting to drop and the gates are down, blocking the road:

58.666666666 (feet per second) x 3.75 (seconds before the gates start to drop) x 2 (to make sure the gates are down) = 440 feet

Therefore, in order for the gates to be down before the train, traveling at 40 miles per hour, passes thru the crossing, the outermost trigger (which actives the crossing) should be 440 feet away from the crossing. However, I would place the trigger 660 feet, 1/8th of a mile away, to be 100% certain that the gates are down when the train goes thru the crossing.

Please note that depending on the speed, the distance that you have to place the outermost trigger will have to be closer or further away from the crossing so that the gates are down by the time the train passes thru the crossing.

This math applies also to any crossings without gates.

Hopefully anyone who read this is able to understand it.