Unfortunately, my knowledge of tunnels from the teens, is essentially non-existent. I simply have not observed any tunnels from the teens that I could verify the dates of. The tin tunnel pictured above, is shown in the 1910 catalog. The 1914 catalog does not show its tunnel in great detail, but again that should be a German manufactured tunnel.
The 1916 catalog appears to show the first composition style tunnels and lists the following tunnels:
80 - 6.5 inches long
81 - 8.5 inches long
82 - 11 inches long
83 - 14 inches long
84 - 16 inches long
The 1917 Dealer's Price List indicates the following tunnels:
81 - 8.5 inch straight tunnel
82 - 11 inch straight tunnel
83 - inch straight tunnel
84A - 16 inch straight tunnel
84B - 16 inch curved tunnel
85 - 19 inch straight tunnel
The 1919 catalog lists only the
82 - 10 inches long
83 - 14.5 inches long
I would suspect that these tunnels likely look similar to the tunnels from the early 1920s, but like I said, I have never observed one that I could verify the date of.
The following tunnel is a #82 tunnel that came with a boxed #19 set from 1921. Side A
Side B
This is tunnel #83, which came with a boxed 1921 set. Side A
Side B
The 1921 foldout lists tunnels
81 - 8 inches long
82 - 10 inches long
83 - 15 inches long
84 - 18 inches long
NWL
