Dear list members,
For the transliteration of 
IAST uses   (l underbar)
ISO 15919 uses 
(l underdot)
Jonas Buchholtz uses (l with two dots unde)
Do either Harvard-Kyoto  (Kyoto-Harvard ?) I'm never sure its official name :-) or Velthuis have an official or unofficial transliteration letter for   ळ 
Thanks,
Harry Spier