GRGR: Sour smell of rolling-stock abscence

[Bob Norton]

Chris asks:

> Also, on page 3, what is "a sour smell of rolling-stock absence?"  
>     
>     Anyone?
>
My take on this is that without any rolling-stock (particularly engines),
the dominate aroma of a train station would be old grease, stagnant water
and oil. When the engines are there, especially the coal fueled ones of
that period, the station would have a different odor, smokier and less
sour. Just a guess.