How does lyman beecher compare intemperance with the slave trade?

Lyman talks about intemperance as something that is to be fought off. It mentions it as something terrible that ruins families and that we should execrate just as we execrate the cruelties of slave trade.

It isn't really a comparison. It more of an appeal to see one as a horrible thing just like we see the other.

In his own words:

"We execrate the cruelties of the slave trade—the husband torn from the  bosom of his wife—the son from his father—brothers and sisters separated  forever—whole families in a moment ruined! But are there no similar  enormities to be witnessed in the United States? None indeed perpetrated  by the bayonet—but many, very many, perpetrated by intemperance."

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.