What is the significance of montresor's name dress, coat of arms, and family motto?

The coat of arms gives us a motive to comprehend why Montresor is so intolerant in getting vengeance from Fortunato. The picture on the coat of arms is one of a golden foot devastating a snake which has its fangs entrenched in the heel of the foot. The saying of the Montresor is “nemo me impune lacessit.” When translated in English, it means no one chastises me and gets gone with it. Fortunato had obviously disrespected Montresor’s name at some point. Just as his family coat of arms speaks so. The picture strengthens that image. Evidentially, Montresor contemplates Fortunato to be the snake and Montresor is the foot that is soon to crush and slaughter him. 

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.