noun
train, railway
A1
'Bahn' (die) mainly means 'train' or 'railway' (e.g. die Bahn = national rail). Feminine noun with plural 'Bahnen'. Common collocation: 'mit der Bahn' (by train). Regular declension; no irregular plural. Frequently appears in compounds (S‑Bahn, Bahnsteig), especially to indicate rail transport.
Examples
Ich fahre gern mit der Bahn.
I like travelling by rail.
Die Bahn hat heute Verspätung.
The train is delayed today.
Die Verspätung der Bahn ärgerte die Pendler sehr, sodass viele ihre Pläne änderten.
The train's delay annoyed the commuters a lot, so many changed their plans.
Details
Mnemonics
Picture rails forming a big letter 'B' for 'Bahn'.
Sounds like English 'bahn' — imagine a 'bahn' sign at a train station.
die — imagine a female conductor waving on the railway (die Bahn).
Notes
Bahn can mean the train itself or the railway system. When referring to a service/company it's also 'die Bahn' (e.g., Deutsche Bahn).