Alan Murray will present a clinic on constructing the Viaduct for Jon Bentz’ Rio Como layout at the December 9th 7PM virtual meeting of the Skagit Valley & Whidbey NMRA Clinic. Construction of trestles often begins by constructing the girders, ties and installation of rails on a level base. After placing the assembly on the layout, trestle bents can be framed and trimmed to fit the topographic conditions that will exist below the trestle.

In the case of the Rio Como Viaduct, a single-lane vehicle crossing over the Rio Como main line needed to climb from the level of the mainline to a height sufficient to provide clearance for the largest Bachmann ON30, 4-6-0 locomotive. The viaduct contains a King Post span with tension rod, a 90-degree horizontal curve, vertical curves and short tangents with grades up to 15 percent. The presentation will concentrate on techniques in the construction of the viaduct. Material choices, cutting and drilling techniques, use of jigs and installation of NBW’s will be discussed.

ZOOM Link, waiting room will be open after 6:30pm for chit chat

Topic: SV&W NMRA December Clinic
Time: Dec 9, 2020 07:00 PM Pacific Time (US and Canada)

Join Zoom Meeting
https://zoom.us/j/97354958130?pwd=ZjB6VFJyZ3ZOOTc4djlSMUlhYlpWUT09

Meeting ID: 973 5495 8130
Passcode: 410875