すみません、この荷物、邪魔になっていませんか？ — Excuse me, is this luggage getting in the way? (Train · Etiquette, Formal — to stranger, JLPT N4)

Gesture & etiquette

Point to your luggage, then to the path/person, with an apologetic expression.

Always be mindful of your surroundings and other passengers, especially with large luggage on crowded trains. Avoid blocking aisles or doors.