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| Title: |
PRR 4-4-4-4 #5507 |
| Description: |
This unique experimental 4-4-4-4 wheel configuration was built by the PRR's Altoona Shops in 1945. It lasted 8 years before being scrapped in 1953. According to Wikipeida, tje T1 duplex drive 4-4-4-4 steam locos were ambitious, technologically sophisticated, powerful, fast and distinctively streamlined by Raymond Loewy. However, they were also prone to wheelslip both when starting and at speed, in addition to being complicated to maintain and expensive to run. Partial specs - T-1 class, 80" drivers, 300 psi,massive engine weight of 502,200 lb, tractive effort 64,653 lb, |
| Photo Date: |
8/5/1948 Upload Date: 6/29/2025 9:01:42 AM |
| Location: |
Crestline, OH |
| Author: |
Gary Everhart |
| Categories: |
Roster,Yard,Steam |
| Locomotives: |
PRR 5507(4-4-4-4) |
| Views: |
17 Comments: 0 |
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| Title: |
PRR 4-4-4-4 #6110 |
| Description: |
This later T1 duplex was built by Baldwin in 1942. The exterior styling was designed by Raymond Loewy, According to SteamLocomotive.com " The theory behind the duplex drive held that reducing the masses of reciprocating (e.g., main and side rods) and revolving (e.g., cranks and counterweights) would reduce hammering and raise speed. Tests run at a high boiler pressure and late cut-off showed 6,110 drawbar horsepower at 85 mph. In service, these engines could be fast, powerful, and smooth, pulling 910-ton passenger trains at 100 mph. According to most sources, the divided drive proved to be a major maintenance headache, however, because no way could be found to stop one or the other driver-cylinder set from slipping, either starting or, more alarmingly, at high speed. This liability proved fatal to the chances for real success for these engines, and they were retired well before the much earlier vintage K-4 Pacifics." Roger D. Kruger photo |
| Photo Date: |
4/1/1949 Upload Date: 6/29/2025 9:01:43 AM |
| Location: |
Chicago, IL |
| Author: |
Gary Everhart |
| Categories: |
Roster,Yard,Steam |
| Locomotives: |
PRR 6110(UNKNOWN) |
| Views: |
17 Comments: 0 |
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