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# Thread: World's fastest steam locomotive - photos

1. ## The Following 3 Users Say Thank You to Jon For This Useful Post:

baja (10-15-2019), jimfols (10-14-2019), Rangi (10-14-2019)

2. She's a beauty. 7.5' drivers. I wanted to know the piston speed at 110 MPH but could not find the stroke.

3. На картинке великолепный вид. Но увидеть в живую совсем другое зрелище.

4. Stroke: 660 mm, or 26", driving wheels : 415 rpm @ 50 m/s

5. ## World's Fastest ?

Wikipedia write up states: "On 11 October 1972 during a trial run it attained a top speed of 182.4 km/h or 113.3 mph. As a result, it is the fastest, operational steam locomotive in the world."

Elsewhere Wikipedia states: "Mallard is the holder of the world speed record for steam locomotives at 126 mph (203 km/h). The record was achieved on 3 July 1938 on the slight downward grade of Stoke Bank south of Grantham on the East Coast Main Line, and the highest speed was recorded at milepost 90¼, between Little Bytham and Essendine. It broke the 1936 German (DRG Class 05) 002's record of 124.5 mph (200.4 km/h)."

I guess if you search hard enough there will be various claims to be the fastes steam loco. Mallard is in the excellent York railway museum for any steam buffs visiting the UK.

Regards, Ed

6. Hence 420,5 rpm @ 50,6 m/s of the drive wheels (also unrealistically assuming "no slip").
Assuming the stroke also being the diameter of the conrod bolt - peripheral speed of that bolt circle would thus be 14,5 m/s*- right?

Then the piston's varying velocity and direction during the wheel's turn, would need a formula & graph entirely above my pay grade,
assuming that the conrod length, vector analysis etc being established.

*Conrod bolt circle dia: 0,66 m / Wheel dia: 2,3 m X speed: 50,6 = 14,5 m/s

7. Originally Posted by DIYSwede
Stroke: 660 mm, or 26", driving wheels : 415 rpm @ 50 m/s
Silly me. I went searching when all I had to do was click the link under the picture. Than you.

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