Very few, if any. They may not have escalators (Covent garden, for eg., but no-one in their right mind uses that - just use Leicester Square and walk on the street) but there are almost always ways of getting up to the street, and assistance is signposted for people with problems.

> platforms are often at a significant offset from the underground cars

Not sure what you mean here - mind the gap? Typically less on the Piccadilly than some other lines - Bank on the Central is particularly scary.

Based on living 30-odd years in London, most of it using the Piccadilly line on my daily commute and to get to LHR.

Sounding like a TfL groupie here, but it is a pretty good transit system, given geographic and budgetary constraints.

Agree that the Underground is good in general. I've used it a lot. That particular trip was just a case of having heavier luggage than I usually carry and I should have handled things differently.

In 1906, people travelling with three suitcases would likely have servants carrying them, and no one cared particularly about comfort of servants.

But total wealth was a lot lower than today, while clothes were much more expensive relative to the average income than today. Many people wore their best clothes on Sundays only, and street photos from the same period show that an average person was dressed rather simply.

I don't even think that the tube was affordable to average working class public. When I read historic accounts from much later (the 1930s), they mention that fare on public transport was expensive enough that you had to choose between a breakfast and a ride.