I didn't realise that there were railways in the UK in 1745. However, from 'Collins Encyclopaedaia of Scotland',

'RAILWAYS. EARLY ORIGINS. The mining of coal stimulated the construction of early railways, more properly known as wagonways, in Scotland as in other parts of the UK. The first was laid out between Tranent and Cockenzie [near Prestonpans] in 1722...the [Prestonpanss] line enjoyed unusual notoriety by being fought over in the Battle of Prestonpans and there is a passing mention of it in the famous song Hey Johhnie Cope'.