Free versions of DIN are available here: http://www.triskele.com/fonts/index.html There's only the regular weight, but you can beef it up with a stroke if need be.
City Medium: http://www.bertholdtypes.com/bq_library/90058.html ...also known as Square Slabserif 711: http://www.myfonts.com/fonts/bitstream/squ...rif-711/medium/