I was busy celebrating "Bike-To-Work Day" here in my city just last Thursday. So my faithful Brompton accompanied me everywhere that day as my local transit companies offered free fare if the bike was with me. I was going up an escalator with the bike on the step in front of me. I had my newly sewn front bag with the Front Carrier System's frame attached to it which I was also testing that day in my right hand. My backpack's strap did not line up very well with my shoulder so I was attempting to adjust it back into place. I was a fraction of a second too slow to grasp the Brompton to step onto solid floor and over the bike I went. My front bag with it's frame clattered beside me. My poor Brompton tumbled over too underneath me. I heard the klaxons rang loudly but surprisingly the stairs did not stop right away. I was able to clear the stairs (I am glad to report that the Brompton was able to clear them too by itself as it fell clear of the moving parts) yet the mass of bodies did not. I felt many bodies kept coming. Finally stairs stopped as the people did. (?) I was unhurt. The Brompton except for some scuff marks and one small scratch seem to be fine. Although later that day the chain jumped off the chain ring, cog, and the chain tensioner as I was headed to the new Brompton dealer located closer to my residence to check out the new bikes. I put the bike alongside a brick wall and placed the chain back on track using a shiny paper advertisement out of a newspaper I had on me to limit grease getting all over my hands.. The strangest thing is the shifting was very sluggish and hard to move the shifter before the accident. Afterward when I had to replace the chain back, I can shift better with no resistance and each gear clicks into position as it did when the bike was new. Go figure.