。
It's only four minutes from here by train.
Literal
Train [by-ならで] here [from-から] only 4-minutes [copula-だ].
ならで isn't standard — this is 列車でなら ('if by train'), with the なら conditional in a conspicuous post-particle position. 列車でなら = 'by train (if that's the means).' ~なら as a conditional marker attaches after で here, which is common in casual Japanese for 'if X is the case.' The sentence is slightly awkward but grammatical.