PASSENGER TRACK SPACING

I am modeling Union Station in Denver, CO 1953. The track layout alternated between passenger platform, single track, trucking platform, single track, passenger platform etc… The passenger platforms I am using are Walthers™ butterfly platforms which are 2-1/8" wide. How wide should the track bed be?
Thanks,
Roger

Try this link.

http://www.nmra.org/standards/s-8.html

If I can remember to take a measuring tape with me to work tomorrow, I’ll measure them for you. Track one and the commesary set out tracks weres replaced with a bus lane a while back but all the next 4 are in their original places.

The distance between passenger platform tracks is 330" or 27.5 feet.
The distance between truck platform tracks is 294" or 24.5 feet.

So
Track 1 - 2 are 27.5 feet appart and have a passenger cover between them.
Track 2 - 3 are 24.5 feet apart and have just a slab of concrete no covers where service vehicles can go. This is also where the pedistals for water, steam, and electricity are.
Track 3 - 4 are 27.5 feet apart
etc.
I don’t know if there were 12 or 18 tracks in 1953. I cannot find any pictures where track #9 and beyond are covered.