Today I got a copy of the NS Harrisburg Division track guide. So far I understand most of the symbols and abreviations. The one thing I'm having a little trouble with is the traffic density numbers. On the section of track I'm most intrested in it says the density to the west is 0.1 and the density going east is 0.3. I'm assuming this is 100 tons west and 300 tons going east. Is this correct? If not, what do these numbers mean?