Airlines don’t have a large luggage storage area at the front of the plane.
Back in the days of the 707's DC8's there was a coat closet at the entry door -
AHEM ! To be used for First Class customers coats jackets etc. and occasional
handicap wheelchair walker mobility aid.
During boarding usually a curtain was pulled closed to restrict access to
First Class customers and storage of the HC aid.
Woe be to the heathen coach customer thinking it was their private closet !
Coat closets still exist on some late model aircraft but the usage is still for
the premium customer.
And then the Flight Attendant Crew needs some room to store their bags.
What has happened with the later models of airplanes is the overhead bins
have got wider and maybe a inch or two deeper in depth with a PA from the
FAs to put the carry on baggage to fit the dimensions of space SHARING not
Squandering the space selfishly. Namely wheels and handles outward to the
edge of the bin with hats coats loose items on top of said bin baggage.
Most interesting and sneered about carry on baggage was the WIG Container
circular shape about 18 inches high by 15 inches in diameter that did not
fit the 707 DC8 bin. A styrofoam mannequin head to keep the wig from
getting a new hairdo. After arguments the said wig container had to be
checked to the hold of a seat bought for it.
On another expensive seat acquisition was a million dollar art painting -
4 feet by 6 feet - the customer bought 6 coach seats in the back of the
airplane to secure the painting safely.
Train crews no doubt have resources to take care of carry-on luggage
and checkable baggage at stations with no baggage check-in.
I haven't traveled enough to rate this one way or another - but the
space available in train cabins is immense compared to the airplane
and there is little danger in luggage leaping from the floor to the
ceiling going across switches and grade crossings - maybe with
wheels scurrying across aisles a tripping event ?