This road leaves the Denver and Rio Grande at Silverton, and runs over a divide 11 113 feet above sea level, then down into the rich mining country beyond. The country is very rough and rugged, and in order to reach the town of Red Mountain it was necessary to run up on a switchback, as no room for a loop could be found. A wye was, therefore, built, and the engine could be turned while the train stood on the main track. The engine was thus placed ahead of the train, only the train is pulled out of the station rear end ahead. It runs thus till the turn-table is reached. The train is stopped at a point marked A, Plate XXII; the engine uncoupled, run on to the table, is turned and pulled up to a point near B, where it is stopped. The train is then allowed to drop down to the turn-table and the engine backed on to it. In coming up from Albany the train is stopped on the down grade between the summit at B and the table; the engine is taken off, turned on the table and run up to about A; the train is then allowed to drop to the table as before and the engine backed up and coupled on, taking not over five minutes in going either way. The reason of putting the table in was that there were no mines to the east of Ironton as shown on Plate XXI, but between the turn-table and the loop there were several that it was very desireable to reach, and the side hill is so steep that it is impossible to make a loop on it. This table is the source of a great deal of comment from tourists, of whom there are many during the summer months, as it is on the line known as the “circle,” so extensively advertised by the Denver and Rio Grande Railroad. The road is used both for a freight and passenger road, and as before mentioned, is the best paying road in Colorado, two engines being kept busy hauling ore to Silverton from the Red Mountain district. The object of writing this paper was to describe what the author thinks is quite a novelty, being the only turn-table that he has ever heard of which is used upon a switchback in this manner, and where the grades are adjusted as they are to let the train run by gravity on the table from both ways. Plate XXI is a print from a photograph of the map filed in Washington, and is about 9 000 feet to the inch. Plate XXII is an enlarged sketch of the line near the turn-table. DISCUSSION.