Syd Schofield
Editors note: This is the second article of a new series on narrow gauge by Syd Schofield. The previous article is available by clicking here, or by filtering with the category “Narrow Gauge”. Syd welcomes discussions and feedback, which can be made by clicking on the comment link at the bottom of the post.
Narrow gauge railroad track isn’t much different than the “standard” four feet eight and one half inch gauge track on a lesser, “junior varsity” short line or a somewhat neglected spur. The main consideration is the weight of the heaviest wheel set to be supported. This results in a balance of rail strength and tie (or sleeper if you’re not from around here) spacing. So a K-37 would require heavier rail and closer ties, maybe even with tie plates to further spreads the weight over a larger foot print (bearing area) on the tie than needed by an 0-4-0.
In the early days (the Civil War and on) the materials involved were wrought iron with high strength alloy steel used later on. The rail deteriorates in elastic fatigue as a beam loaded between the ties as well as surface region fatigue due to the dual flexing (also elastic) of the contact area of the wheels, wheel on rail, with the rail top. Large rail grinding machines are used today to make an “insurance cut” of the affected rail top region. As rail was replaced due to fatigue and insufficient capacity, rails were often upgraded in size and material and the locally available, minimally prepared ties were upgraded with ties milled for tie plates and spike pilot holes off-site. Notably, spikes are made with a chisel point across the grain of the tie so as to break the fibers but remain supportive in the lengthwise direction as opposed to splitting the fibers opening an unsupported gap in the lengthwise direction.
What all this leads to is a hand driven single spike on each side of the rail in every tie for the earlier years / low budget / low capacity remote business or the store-bought closely spaced ties with tie plates and four spikes per plate for more modern or high capacity / well-financed business. With a little preparation of the Peco / Micro-Engineering / Shinohara nickel silver flex track and turnouts, to name a few, with an X-Acto knife and Dremel tool plus coloring and ballasting practices, the tie can look a little neglected and more representative of the frugal / back woods / mine supply / agricultural on a short life plan railroad. The actual time spent between the two methods is reportedly similar when appropriate skills and experience levels are achieved.
In addition to the Washington common carrier narrow gauge railroads previously mentioned we include the Alaska portion of the Pacific Northwest Region Forth Division: Golovin Bay Railroad, Seward Peninsula Railroad, Tanana Valley Railroad, and the still active and very popular White Pass and Yukon Railroad. And, as in Washington, there were numerous privately owned company railroads for support of logging, mining and other enterprises.