Having acquired six locomotives (now reduced to five) I found that I'd not numbered them consecutively. To make sense of the numbering as it exisits I came up with a potted history of the line's motive power. Something like this (locomotives used on the layout shown in heavy type)
1 0-4-0ST Porter 1892 2 0-4-0ST " 1892 - scrapped after accident 1915
3 0-4-0ST " 1899 - re-numbered 8 following rebuild in 1929
4 0-4-0ST " 1899 - rebuilt 1929 using parts from first #5 5 20t diesel Plymouth 1940 (original Porter loco of 1899 laid aside 1928)
6 2-4-2T Baldwin 1910 - laid aside 1928, sold 1940
7 0-4-0T Porter 1920 8 0-4-0ST " 1929 formerly #3, rebuilt as coal burning locomotive From this we see that the line opened with two locomotives, and that three more were acquired to handle the mining and timber trains when the extension to Clydes Creek opened. The hoped-for extra traffic on the extension to Bonneyville caused the acquisition of a larger Baldwin but the traffic never really warranted the purchase, as the loco was expensive to run and tended to damage the track. It was therefore laid aside in 1928, along with one of the later Porters, as the financial climate worsened at the end of this decade. To replace them, one of the 1899 machines was rebuilt locally to burn coal as the bunker could hold enough fuel to reach Bonneyville without refuelling en-route - something the wood-burners often needed. As the financial climate improved at the end of the 1930s the Baldwin was sold, allowing the purchase of a new Plymouth diesel - needed to help the now rather elderly collection of steam locomotives keep the traffic moving (the layout is set in 1941).
Perhaps not entirely convincing, but it does try and explain why the locomotive are numbered the way they are.
<message edited by C&S on 09/11/10 11:10 PM>