2331264 UNION PACIFIC VISION BIG BOY #4014-O QuickBooks A bottoming tap has almost

A bottoming tap has almost no taper at the end because it is designed to thread all the way to the bottom of its reach

They provide structural support

Gauge of track and turnouts

It was the final decade of friction bearings and roofwalks

Four pieces of track make up one-third (120 degrees) of a 36” diameter circle

2331264 UNION PACIFIC VISION BIG BOY #4014-O QuickBooks A bottoming tap has almostUnion Pacific's twenty five 4 8 8 4 Big Boy locomotives have been leaving lasting impressions since the day they first rolled out of the American Locomotive Co. Schenectady erecting shop. For all that has been said of their size, the Big Boys were just as impressive for their performance. Today, Big Boy #4014 is the pride of the railroad and draws fans from around the world. The Big Boy has been reproduced in every conceivable scale and way, including