6 7-200,000 400,000 600,000 800,000 1,000,000 1,200,000 20 30 40 50 Avg Speed of Trains Optimal Tons moved in 24 Hrs. Impact of Multiple Intermediate Signals Impact of two Sidings Impact of car and locomotive technology Figure 2 – Subdivision with one siding Figure 3 – Subdivision with two sidings Figure 4 – Subdivision with two sidings