§ 104. Transfer of officers and employees. Officers and employees of the transit commission exercising functions and performing service in respect to subject or matters, jurisdiction of which was transferred to the board of transportation, shall be eligible for transfer and appointment without examination to offices and positions in the office of the board of transportation; and, so far as necessity for such service exists, shall be so transferred and appointed. Officers and employees of the transit commission, having prior to July first, nineteen hundred forty exercised functions and having performed services in respect to subjects or matters, jurisdiction of which was transferred to the board of transportation, shall be eligible to have their records of service transferred to the municipal civil service commission to be credited as service rendered for the city.