A system for enabling the performance of electronic commerce transactions includes a central controller for integrating together a plurality of legacy systems allowing an exchange of data relating to electronic commerce transaction between the central controller and each of the legacy systems. Linearly polarized incident light enters a transmissive liquid crystal device, in which oblique incident light is changed into elliptically polarized light. The magnitude of the reverse bias is limited by the value of a reverse current flowing through the light-emitting device. A layer of epoxy is sandwiched between a rail joint bar and railroad rail and comprises a rigid epoxy on lateral portions of a first side of a rail joint bar and a flexible epoxy placed on a central portion of the first side of a rail joint bar. In a modified form, either one of the two transfer devices is used as bypass conveyor or return conveyor. 25% of the defoamer by weight based on the mixture.