Recruitment to the Indian Railway Service of Signal Engineers (IRSSE) occurs through a bifurcated system of 50% direct recruitment via UPSC and 50% promotion from Group-B officers, with promotees receiving ... seniority weightage under Rule 334 of IREM. Although the CAT upheld the removal of arbitrariness in seniority assignment, direct recruits subsequently contested the adherence to the amended regulations, citing violations of the CAT's directive.