Devoted husband and wife, who were childhood sweethearts, and having raised several children. Now, working on the Ffarquhar branch line, together as they have always liked to be. They act as parental figures to Mavis - who Toby has remarked reminds him of Henrietta when they were younger - and Toby sometimes steps in as a father figure for Percy in Zebedee's absence.
My rendition of Toby is based more on the Railway Series version, while Henrietta is more of an amalgamation of her book and tv versions.
Originally - largely because I shipped Toby with Mavis at the time - I had planned for them to be siblings, but once I got back into the fandom, this changed. The ship still exists in a twisted form in an AU.
Also, Toby smokes a pipe in all my renditions, because why not? He may or may not smoke something other than tobacco on occasion. He's also very attracted to Henrietta, even after all these years.