Infectious commuting

After I got over my cold, I seemed to get another, for the following weekend, which would fit with my contracting them on my commuting on-site days. For my latest day on-site, I realized that, for Reasons, I used my ScotRail card to ride the Glasgow subway, and my Glasgow subway (really, Strathclyde Partnership for Transport) card for riding the ScotRail trains. I'll be going back in on Monday via a less inverted arrangement. I use smartcards rather than cellphone apps because I dislike being reliant on my telephone and its apps all working.