The figures show a 14% reduction in the number of incidents causing customer delays on this quarter last year, but despite the lower incident count, the number of lost customer hours due increased compares to the same measure last year.
The number of days where services experienced zero delays did rise, from 24 to 28 over twelve months.
Faults involving station facilities such as escalators accounted for the majority of delays, resulting in Tube Lines narrowly missing their target for this year.
Response times for rectifying faults were better than target for this year.
General improvements to stations that have been made include better lighting, cleaning, and new seat covers added to northern line services, however the target outlined improving the general ambience still were missed.
Tube Lines also announced they had spent £15M more than their projected capital expenditure for the year so far, which they attribute to bringing forward work on the stations improvement program.
They have also won more contracts to provide step-free access for five stations on the Northern, Piccadilly and Jubilee lines.