There are a variety of answers. Traffic could be one, or schedule changes. For trains, probably the latter reason.
yes
3am
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She does not always come late.
Always Late with Your Kisses was created in 1951.
Someone who is always late is called tardy, a procrastinator, and terminally late.
Yes, someone is always hiring there.
You are always late for class.
Always is an adverb of frequency, tells us how often. It modifies the adjective "late."
because he sleeps in to late!
Look on either the exhaust manifold or exhaust pipe.
my bus is always late