I often did it. It was about maximising time for me as a single working parent, trying to get kids in one direction & me in the other for school & work. And also being a bit crap with time
But genuinely I had an insane schedule. My kids are really busy, my job is too, I've no support & somehow always crap childcare. So often in the morning I was trying to do a bit of housework, washes on, batch of ironing, cook the evening meal, as evenings were tied up with kids' sports.
My train was relatively quiet, table in front me, not lashing on make up in a packed train.
But still, once or twice, there was a jolt, make up went everywhere & I felt mortified. It didn't spill on anyone but they'd be trying to retrieve it from under seats & so on.
And then I'd think - I need a new plan.
Unlikely to happen again due to changes post-Covid.