4mm Scale Train Speed Calculator

Procedure

Measure the journey time of your train over a short distance, e.g. 36 inches.

Enter the distance and time in the fields below.

Click the 'Speed ?' button to discover the train speed.

Calculator

(fixed)

Speed Chart (displays below)

Information

Prototype Train Speeds

Feight

Non vacuum brakes: 25mph
Vacuum fitted brakes: 40mph
Express perishables: 60mph

Formulae

1 mile = 63360 inches
1 hour = 3600 seconds
Scale = 1/76 (00)

Example :

Model train travels 12 inches in 1 second.
12 in x 76 scale = 912 inches full scale
912 in. / 63360 in. = 0.0143939 miles
1 s / 3600 s = 0.000277777 hours

Speed = distance / time
Speed = 0.0143939 / 0.000277777 = 51.81 MPH