The other day someone said they had over 400 MTH engines. My thought was, 'If I bought one of all the 'O' Gauge motive power that was issued since 1970 through 2000 how many engines would I have?' Because I don't have that many years left I limited the quest to Lionel (PW reissues, New 'O' Gauge tooling and Scale issues other than MTH contract 89-94 more or less), Williams, Weaver Atlas and MTH.
These are probably almost but not quite accurate numbers because it all depends on how you count especially with Lionel. These totals include diesel, electric and steam.
The answer turns out to be:
Lionel (PW reissues, 24, new 'O' Gauge tooling, 30 and Scale, 15 plus 12 with MTH).
Williams (Brass, Aluminum and ABS, 39).
Weaver (all, 39 including 26 with MTH).
Atlas (2).
MTH (71).
The final number is 232 different items produced from 1970 thru 2000. I did not bother putting prices with the units but I am confident you would be north of $150,000 if you were the proud owner of one of each.
If someone has more accurate estimates please share them.