Ed,
As Mike said, industry standard was high stands on the main, and low stands in the yards and side tracks. I doubt it had anything to do with snow level, as it was some poor schmucks job to shovel these damn things out every time it snowed. Remember, the throwing lever was past the stand and enough snow had to be moved so that a man could stand and "bend the iron". This would have left stands in the clear whether high or low.
There is a lot of information on snow-clearing which shows the rotaries, plows and spreaders, but the real grunt work of clearing snow then as today, was shoveling out the switches and deicing the flangeways. Nasty hard, wet, cold work, not very romantic and hence poorly documented.
Burr Hubbell