Table:
text: RapidKL Rail
Current network
Current network
Line Began_operation Stations Length_km Terminals
1 September 1998 24 29 Kelana Jaya Gombak
Due 2014 13 17 Kelana Jaya Putra Heights
16 December 1995 25 27 Ampang Sultan Ismail
11 July 1998 25 27 Chan Sow Lin Sri Petaling
6 December 1998 25 27 Sultan Ismail Sentul Timur
Due 2014 13 17.7 Sri Petaling Putra Heights
31 August 2003 11 8.6 KL Sentral Titiwangsa
Due 2016 31 51 Sungai Buloh Kajang

Question: When was the earliest one length Sultan Ismail and 27+ station service for RapidKL Rail started?

Question: What is the average operation at RapidKL Rail starting with a length of ampang and over 27 stations?