This template is intended to allow entry of imperial weights (Avoirdupois), measured in [long] tons and hundredweights (ton,cwt) and provide a conversion into pounds and [metric] tonnes.
The value for pounds (lb) is rounded to the nearest 100. The value for tonnes (t) is rounded to 1 decimal place.
This format is traditional for the specification of locomotives manufactured or used in the UK, and some other Commonwealth countries.
For example:
Locomotive weight: {{TonCwt to t|35|4}}.
Locomotive weight: {{TonCwt to t|35|4|lk=on}}.