--- In STMFC@yahoogroups.com, "Dennis Storzek" <destorzek@...> wrote:
Further, it might be worth noting that the Soo commonly didn't use their assigned reporting mark on cars until the eighties. Prior to that, they used their name; to quote the 1/58 ORER, "The freight cars of this company are marked "M.St.P.& S.S.M.R.R.Co." and "Soo Line"..." So, it's entirely possible that whoever made the list abbreviated it SOO L or Soo l, which would be where the extra diget one came from.
I bet it's Soo Line 7473. It would have been a 40' gon with a spiral end, IIRC.