T he initial resistance of these wheels is about 17 per cent, increasing gradually as the movement progresses. The second and third pair of driving wheels adjust themselves freely against a somewhat lower initial resistance and through a somewhat less range of lateral movement than that effective on the guiding wheels.
Wheels back of the pivot pair control rear end movement of the locomotive against an initial lateral resistance somewhat lower than that of the guiding wheels.
The effect of this arrangement is to produce a rigidly guided locomotive when on tangent track which adjusts itself freely on curves with a guiding force cushioned in its application. To relieve tendency of locomotives with long wheelbases to overload the driving springs when passing over concave vertical curves at summits and to underload them with corresponding overloading of the truck springs at the ends of the wheelbase when passing over a convex curve an usual degree of flexibility has been provided in the spring rigging by the employment of coil springs at all points of anchorage of spring rigging to the engine bed and trailer truck.
Each of these cushion springs comprises two 8-inch double coils in tandem; they permit the elongation or shortening of what are customarily hangers of fixed length, and permit vertical adjustments throughout the entire wheelbase to conform to track with a minimum of distortion of the adhesion weight on the driving wheels The locomotive as a whole has a three-point suspension.
All driving wheels of the front engine are equalized on each side and the two sides are cross-equalized at the front and to the suspension of the rear end of main equalizer beam, the front end of which bears in the Bissel type center pin of engine truck. Each side of the rear engine is equalized as a unit from front to back, including both trailer wheels. Naturally, the big articulated steamer became a prized attraction at the Los Angeles County Fairgrounds. Over the years it was well cared for by volunteers and museum staff, allowing it to remain in relatively excellent condition considering its age , which was also thanks to Southern California's dry, warm climate.
According to the website SteamLocomotive. It seemed the Big Boy was destined to forever remain a tourist trap until the end of On December 7th Trains Magazine broke a story that Union Pacific was studying the possibility of restoring as part of its Heritage Fleet based in Cheyenne, Wyoming. Please note! The scheduled times listed below are accurate to the best of my knowledge. However, Union Pacific has been known to occasionally amend arrivals and departures.
On display in St. Louis, Missouri at South 15th Street: A. Finally, the unbelievable occurred on July 23, when Union Pacific officially confirmed it had reached an agreement with the Chapter to purchase and restore the massive steamer back to operational status. This news not only caught the attention of the railfan community but also the mainstream media. During early the Big Boy moved from its long-time home and returned to Wyoming, which drew coverage wide and far during its long trip, particularly the initial move out of the fairgrounds which required temporary track laid across the parking lot.
After acquiring the Big Boy Union Pacific delayed its restoration until while the railroad overhauled stablemate That August the project was launched. Thankfully, over the following three years no major delays or issues were found; had been well preserved and maintained by the chapter and dry climate.
The only major change was upgrading her fuel from coal to 5 oil. It is not only cleaner but also greatly improved logistics. Following a series of updates on the restoration, a major event occurred on the night of May 1, when Union Pacific moved the locomotive moved out of the Cheyenne Roundhouse under its own power for the first time since making its final revenue run on July 21, The following day she stretched her legs by undergoing a test run to Greeley, Colorado.
Over the next few days she made her way to Ogden to participate in the Transcontinental Railroad's sesquicentennial May 9th. Following these festivities she will join UP's heritage fleet pool which includes , , DDA40X "Centennial" , and the streamlined "E" units to pull special excursions around the system.
In a gentleman by the name of Andre Kristopans put together a web page highlighting virtually every unit every out-shopped by General Motors' Electro-Motive Division. Alas, in the site closed. However, Don Strack rescued the data and transferred it over to his UtahRails. Big Boy No. The locomotive was retired in December , having traveled 1,, miles in its 20 years in service.
Union Pacific reacquired No. It returned to service in May to celebrate the th Anniversary of the Transcontinental Railroad's Completion.
If you are a supplier, contractor or carrier, please visit the Suppliers page. Union Pacific. Emergencies: Gauge of Track: 4 ft. Stroke: 32 in. Rainfall Totals. River Stages. Sports Person of the Week. Great Health Divide. Gas Price Tracker. Heart of Louisiana. TV Schedule. Latest Newscasts. Investigate TV. Gray DCC. By Marcello Cuadra.
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