If I read a book in train commutes that are 5 to 25 minutes long

>>9952221
If the train commute is that short, I'd be surprised if you retain much of what you read.

I don't know what pseud-cred you're looking for. Barely anyone will recognise what you're reading or even be interested. One in a thousand people might be interested and even then, if the book is doing the job properly, you probably won't want to discuss it right then and there for too long.

I always bring a worn-out copy of IJ onto the train, make sure its dog-earred pages are visible, its bent spine held up high for all eyes to gander at