### Author Topic: Speeeeeed !!  (Read 109 times)

#### Martin

• SECRETARY
• Posts: 68 ##### Speeeeeed !!
« on: September 11, 2023, 19:26:12 PM »
Want to know what speed in miles per hour your trains are travelling?

Note: This gives you an approximate speed only and some numbers have been rounded up/down for ease.

Here is a formula;

1. Mark out a length of track (at least 1yd/3ft (914mm)), multiply by the number of seconds in an hour (3600), the multiply again by the scale of the train (example for 00 this would be 76 (from 1:76)).
2. Now calculate the time the train takes to travel the length of track marked (most mobile phone have a stopwatch) and multiply it by the number of millimeters in a mile (1609000).

Take your result from 2 above and divide it into the result from 1 above (you might get a long answer, but the first two digits before the point will give you the speed in mph).

So the formula is = DISTANCE x 3600 x SCALE / TIME x 1609000

DISTANCE - is space between two points e.g. 1yd (36in - 914mm)

3600 - is the number of seconds in an hour

SCALE - is the scale of the train you are measuring
0   = 1:43.5
00 = 1:76
H0 = 1:87
TT = 1:120
N  = 1:148

TIME - is the time take in seconds for the train to cover the distance between the two points

1609000 - is the number of millimeters in a mile

As mentioned this is not an accurate calculation just an approximation.
Hope you find this of use/interest.

Martin