LSF Version 7.3 - Using Platform LSF HPC

LSF checks the validity of rail options at job submission against the
LSB_RMS_MAXNUMRAILS parameter if it is set in
lsf.conf, which specifies a
maximum value for the
rails option. The default is 32. If incorrect rail option values
pass this check, the job pends forever.
About the rails and railmask options, see the RMS prun command in the RMS
Reference Manual