A somewhat marked Kodak colour slide of a Douglas DC-7 on a runway late at night while it was either being prepared for take off or had just landed and was being disembarked.
This site shows that this particular aircraft, number N6308C was delivered to United Airlines in June 1954 so this picture was obviously taken after that, and the date seems to agree with what I've estimated as the date of many of the slides in this set, which is late 1950s.