RedHat 6.1 has setup-2.0.5, which includes an /etc/csh.login file but no
/etc/csh.cshrc file.  (RedHat 6.0's setup-2.0.2 contained an /etc/csh.cshrc
file that's almost identical to 6.1's /etc/csh.login.)

If I connect to a 6.1 machine and actually get a login prompt, the
/etc/csh.login file is executed, but: If I connect using ssh to execute a
single command, as in

  ssh redhat6.1-machinename command-to-execute

then the /etc/csh.login file is *not* executed (and, thus, the path is not
as expected).  This is true whether I use ssh1 or ssh2.  (Alas, I don't
know enough about ssh or about which scripts are executed when to know how
ssh the connections differ.)