I am building a model railroad with a ruling grade of 3 - 3.5%. Time is early fall 1979 (or late winter 1981). My roster consists of 3 GP9s outfitted with 567D3A prime movers rated 2500hp. 2 Alco PAs and 3 PBs outfitted with 1800hp 251 prime movers, and 3 to 10 SD35s. My trains will consist of 2-12 cars + caboose. I would like to run up to 45 car trains. Most traffic will consist of lumber/forestry products, automotive, and rock from the 3 online quarries.
I found an army site with some equasions
HPx30= starting Tractive Effort : HPx300/speed=TE
and No of Cars = TE/ [3+(20xruling Grade%)]xWeight of cars
Also included was tables for weight of car taking into accout friction and drag like a 70Ton car would be 105 in the equation and a 120T would be 160 Tons.
Does this sound right? or do I need to find a table somewhere with similar grades and use their TE tables or what? Thanks in advance for any help provided.
Tags: