This paper investigates truth-telling mechanisms for individual M/M/1 queueing systems to share their capacity. The cost we consider in this paper is congestion cost incurred by customers in the queueing system, wherein the unit congestion cost of each individual queueing system is private information. We first propose two Grove-Clarke mechanisms (truth-telling mechanisms) that satisfy budget balancedness and individual rationality, respectively. Then, we conduct numerical studies to evaluate performance of the proposed mechanisms. The results show that the proposed mechanism which satisfies individual rationality has very high percentage of budget coverage. This mechanism justifies the practice of requiring membership fees to join a cooperative alliance, and has good potential for practical applications.